> sapa = to be known
> sapare = that which is known > knowledge, fact
> sapibe = that which comes to know > learner, student
> sap(er)i = knowing
> sapari = known
> sapo = manifestation of knowledge > information, facts
> sape = one who knows
> sapisi = knowing a lot > wise, knowledgeable
> sapimi = knowing little > ignorant
> sapise = one who knows a lot > wise one
> sapibuk = institution for learning > school
> sapik = knowledge (in the general sense)

I know it's... very late for that, but may I suggest a more isolating
approach? For example, making the agentive suffix identical to the root for
"person/people" or replacing it by that word altogether, the causative
suffix by "make" or "cause" or suchlike, the augmentative by "big" and the
diminutive by "small"? In other words, if "one who knows a lot" can be a
"much-know-man", why shouldn't they be?

We are not at war with Eastasia. We have never been at war with Eastasia ;-)